Requirements are written by those who understand
the market. Market Requirements are comprised of
the problems that are in the market. Notice the
language: there are no marketing requirements;
only market requirements. The market-driven
product manager spends time out of the building
gathering requirements rather than sitting in a
cubicle imagining what the market will buy. By
calling on various segments of the market, Product
Management can articulate exactly the right
product features to create a product that will sell.